pop a splint
v. phr.β Β«The injury is in the area behind the knee, and is caused by too much stress on a bone that results in its outer covering becoming inflamed. In racing parlance, itβs called “popping a splint.”Β» ββBellamy Road Hurt, Off Triple Crown Trail” in New York City ABC News May 10, 2005. (source: Double-Tongued Dictionary)